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ADM1491E:  5 V, 16 Mbps, ESD Protected, Full-Duplex RS-485 Transceiver (with Driver/Receiver Enable)

Product Details


The ADM1490E/ADM1491E are RS-485 transceivers with ±8 kV ESD protection and is suitable for high speed, full-duplex communication on multipoint transmission lines. In particular, the ADM1491E is designed for use in motor control applications requiring communications at data rates up to 16 Mbps.

The ADM1491E is designed for balanced transmission lines and complies with TIA/EIA-485-A-98. The device has a 12 kΩ receiver input impedance for unit load RS-485 operation allowing up to 32 nodes on the bus.

The differential transmitter outputs and receiver inputs feature electrostatic discharge circuitry that provides protection to ±8 kV using the human body model (HBM).

The ADM1491E operates from a single 5 V power supply. Excessive power dissipation caused by bus contention or output shorting is prevented by short-circuit protection and thermal circuitry.

Short-circuit protection circuits limit the maximum output current to ±250 mA during fault conditions. A thermal shutdown circuit senses if the die temperature rises above 150°C and forces the driver outputs into a high impedance state under this condition.

The receiver of the ADM1491E contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating).

The ADM1491E features extremely fast and closely matched switching times. Minimal driver propagation delays permit transmission at data rates up to 16 Mbps while low skew minimizes EMI interference.

The ADM1491E is fully specified over the commercial and industrial temperature ranges and is available in two packages: a narrow-body 14-lead SOIC and a 10-lead MSOP.

APPLICATIONS

  • RS-485/RS-422 interfaces
  • Industrial field networks
  • High data rate motor controlv
  • Multipoint data transmission systems
  • Single-ended to differential signal conversion

FEATURES and BENEFITS

  • RS-485/RS-422 full duplex transceiver, for high speed motor control applications
  • 16 Mbps data rate
  • ±8 kV ESD protection on RS-485 input/output pins
  • Complies with ANSI/TIA/EIA-485-A-1998
  • Open circuit fail-safe
  • Suitable for 5 V power supply applications
  • 32 nodes on the bus (1 unit load)
  • Thermal shutdown protection
  • Operating temperature range: −40°C to +85°C
  • Packages
    Narrow-body 14-lead SOIC
    10-lead MSOP

ADM1491E Functional Block Diagram

Enter values and click on PowerMe to find power solutions for this IC. PowerMe launch of ADIsimPower Voltage Regulator Design Tool
(Nominal) For IC being powered
Available System Voltage V Operating Voltage Rail V Load Current A

Documentation

Title Content Type File Type
ADM1490E/ADM1491E: 16 Mbps, ESD Protected, Full-Duplex RS-485 Transceivers Data Sheet (Rev D, 02/2012) (pdf, 335 kB) Data Sheets PDF
AN-1176: Component Footprints and Symbols in the Binary .Bxl File Format  (pdf, 671 kB) Application Notes PDF
AN-960: RS-485/RS-422 Circuit Implementation Guide  (pdf, 245 kB) Application Notes PDF
Solving Isolation Challenges in Industrial Automation
This webcast will discuss the role isolation plays in providing protection and reducing the system bit-error-rate, using the specific design challenges of an RS-485 network. Topics to be covered in this presentation will include: Why and when one should isolate, Types of isolation and their advantages, Design Considerations for an RS-485 node (and how this translates to design considerations for signal isolation) as well as many other topics.
Webcasts WEBCAST
Brochure: Motor and Power Control Solutions  (pdf) Overview PDF
Industrial Automation Solutions  (pdf, 6110 kB) Overview PDF
Emerging Energy Applications Solutions Bulletin, Volume 10, Issue 4  (pdf, 1496 kB) Solutions Bulletins PDF
Test & Instrumentation Solutions Bulletin, Volume 10, Issue 3  (pdf, 1334 kB) Solutions Bulletins PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

ADM1491E Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADM1491EBRMZ Status: Production 10 ld MSOP 10 Ind Tube, 50 $1.41 $1.20 Y  Material Info PCN Purchase Sample
ADM1491EBRMZ-REEL7 Status: Production 10 ld MSOP 10 Ind Reel, 1000 - $1.20 Y  Material Info PCN Purchase
ADM1491EBRZ Status: Production 14 ld SOIC 14 Ind Tube, 56 $1.35 $1.15 Y  Material Info PCN Purchase Sample
ADM1491EBRZ-REEL7 Status: Production 14 ld SOIC 14 Ind Reel, 1000 - $1.15 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

Standard RS-485 Full-Duplex (14-lead SOIC) Evaluation Board, EVAL-RS485FDEBZ
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-RS485FDEBZ Status: Production Evaluation Board $30.00 Yes -
ADM1491EBRZ Status: Production 5V, Enhanced ESD, 16 Mbps, 32 nodes, -40C to +85C $2.44 Yes -
ADM3070EARZ Status: Production 3.3V, Enhanced ESD, 250 kbps, 256 nodes, -40C to +85C $1.96 Yes -
ADM3070EYRZ Status: Production 3.3V, Enhanced ESD, 250 kbps, 256 nodes, -40C to +125C $2.15 Yes -
ADM3073EARZ Status: Production 3.3V, Enhanced ESD, 500 kbps, 256 nodes, -40C to +85C $1.96 Yes -
ADM3073EYRZ Status: Last Time Buy 3.3V, Enhanced ESD, 500 kbps, 256 nodes, -40C to +125C $2.15 Yes -
ADM3076EARZ Status: Production 3.3V, Enhanced ESD, 16 Mbps, 256 nodes, -40C to +85C $1.96 Yes -
ADM3076EYRZ Status: Production 3.3V, Enhanced ESD, 16 Mbps, 256 nodes, -40C to +125C $2.15 Yes -
ADM3491AR Status: Production 3.3V, 10 Mbps, 32 nodes, -40C to +85C, Not ROHS Compliant $4.27 No -
ADM3491ARZ Status: Production 3.3V, 10 Mbps, 32 nodes, -40C to +85C $3.69 Yes -
ADM3491EARZ Status: Production 3.3V, Enhanced ESD, 12 Mbps, 32 nodes, -40C to +85C $1.71 Yes -
ADM489ABRZ Status: Production 5V, 250 kbps, 32 nodes, -40 to +85C $2.22 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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